Magnetic capacitor energy module and applications thereof
An energy module includes a capacitance-based power source structure, charging circuitry, a DC-to-DC conversion system, and an energy control module. The capacitance-based power source structure is operable to supply a voltage when the energy module is in a voltage supply mode, wherein, when substantially fully charged, the voltage is at least 48 volts and to receive a charge when the energy module is in a charge mode. The charging circuitry is operable to provide a regulated charge voltage to the capacitance-based power source structure when the energy module is in the charge mode. The DC-to-DC conversion system is operable to convert the voltage into one or more regulated supply voltages when the energy module is in the voltage supply mode. The energy control module is operable to determine the voltage supply mode and the charge mode.
The present U.S. Utility patent application claims priority pursuant to 35 U.S.C. § 119(e) to U.S. Provisional Application No. 62/039,636, entitled “MAGNETIC CAPACITOR ENERGY MODULE AND APPLICATIONS THEREOF”, filed Aug. 20, 2014, which is hereby incorporated herein by reference in its entirety and made part of the present U.S. Utility patent application for all purposes.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot Applicable
INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISCNot Applicable
BACKGROUND OF THE INVENTIONTechnical Field of the Invention
This invention is related to energy storage devices and applications thereof and more particularly to magnetic capacitor energy modules and applications thereof.
Description of Related Art
There are a variety of types of electrical energy storage devices including rechargeable batteries, batteries, electrochemical accumulators, electrolytic capacitors, and electrochemical capacitors (i.e., super capacitors or ultra capacitors). Such electrical energy storage devices are used in a wide variety of applications ranging from portable electronic devices to electric vehicles to alternative power sources. For example, rechargeable batteries are used in cellular telephones, in electric cars, toys, etc.
An electrochemical capacitor, or super capacitor, is a pseudo-hybrid of a conventional capacitor (e.g., an electrolytic capacitor) and a rechargeable battery. In particular, a super capacitor does not have a conventional solid dielectric of an electrolytic capacitor, but includes an electrochemical core that allows the super capacitor to be charged and discharged much faster than a rechargeable battery. Further, the electrochemical core allows the super capacitor to be recharged significantly more times than a rechargeable battery.
While a super capacitor has about 10% of the energy density of a rechargeable battery, it has about 10 to 100 times the power density. Since a super capacitor is a low voltage device (e.g., less than 5 volts), it may be used as an alternative electric power source to that of a rechargeable battery in some low voltage applications.
The energy module 10 includes one or more magnetic capacitors (MCAP) and a voltage conversion system. The one or more MCAPs store energy as a function of a capacitance and voltage (e.g., energy=CV2/2). Accordingly, the greater the capacitance and/or the higher the voltage, the more energy the MCAP is storing. For example, an MCAP constructed in accordance with US patent application entitled “Parallel Plate Magnetic Capacitor And Electric Energy Storage Device” having a publication number of US20090141423 and/or with US patent application entitled “Assembly Of Magnetic Capacitor With Packaging” having a publication number of US20110013339 may have a charge voltage of 300 volts or more, a capacitance of 0.1 Farad, and be constructed on an integrated circuit die having a one square centimeter footprint. Such an MCAP yields five watt-hours of energy, which, in comparison to a lithium ion battery of equivalent size, is up to one hundred times more energy.
In another example, an MCAP may be constructed of a two magnetic conductors separated by a dielectric. In this construction, the capacitance of the MCAP equals the product of the area of the magnetic conductors, a magnetic-dielectric constant, and the permittivity of free space divided by the distance between the two magnetic conductors. The magnetic-dielectric constant is the product of the dielectric constant of the material (or relative permittivity) and a colossal magnetic capacitance effect factor, which has a theoretical limit of 1017. In an embodiment of this MCAP, an MCAP nanocell is formed in a silicon wafer to have the two magnetic conductors separated by the dielectric. A plurality of MCAP nanocells (e.g., hundreds to millions or more) is coupled together using conductive layers to form the MCAP.
Within an MCAP nanocell, each of the magnetic conductors includes a plurality of thin film deposit layers (e.g., each about 1 nanometer thick or less). The thin film deposit layers include one or more copper layers, one or more magnetic material layers, and/or one or more other layers. The magnetic conductors may further include contact points for coupling to the conductive layers of the MCAP. The dielectric material may be tetraethylorthosilicate (TEOS) and/or one or more other materials.
The voltage conversion system may be a DC-to-DC conversion system 28 or an inversion conversion system that converts the voltage of the MCAP into one or more supply voltages (e.g., Vin). For instance, the DC-to-DC conversion system 28 converts the MCAP voltage into A DC supply voltage that may range from a fraction of a volt to a few volts for low voltage applications; may range from a few volts to tens of volts for moderately low voltage applications; may range from tens of voltages to hundreds of volts for moderate voltage applications; and may range from hundreds of volts to thousands of voltage for high voltage applications. For example, if the energy module 10 is used as a replacement for a 1.5-volt battery, then the DC-to-DC conversion system 28 will produce a 1.5-volt supply voltage. As another example, if the energy module 10 is used to replace a 4-volt battery, then the DC-to-DC conversion system 28 will produce a 4-volt supply voltage. As yet another example, if the energy module 10 is used to power a motor, then the DC-to-DC conversion system 28 will produce a supply voltage in the range of a few volts to tens of volts or more. As a further example, when the energy module 10 is used in higher DC voltage applications, the DC-to-DC conversion system 28 will produce in the range of hundreds of volts to thousands of volts.
When the energy module 10 includes the inversion conversion system, the inversion conversion system converts the voltage of the MCAP into one or more AC supply voltages (e.g., Vin). As an example, if the energy module 10 is used in an uninterruptable power source, then the inversion conversion system will produce a supply voltage in the range of tens of volts to hundreds of volts or more. As yet a further example, if the energy module 10 is used in a power grid system, then the inversion conversion system will produce a supply voltage in the range of hundreds of volts to thousands of volts or more.
To facilitate providing the supply voltage from the energy module 10 to the device 12, the device provides feedback to the energy module. The feedback includes operational characteristics of the device 12 (e.g., power requirements based on current loading of the device, what type of device it is, over voltage protection requirements, current limit requirements, etc.), supply voltage requirements (e.g., voltages, current limits, etc.), and/or other data that facilitates the operation of the device 12.
When the energy module 10 is coupled to the device 12 and providing a supply voltage is enabled, the energy module 10 provides one or more supply voltages to the device. The duration of discharging of the energy module 10 depends on the number of 0.1 Farad MCAPs (and/or other valued MCAPs) within the energy module 10 and the loading of the device 12. For instance, if the device 12 is a cellular telephone manufactured in 2014 and the energy module 10 includes just one 0.1 Farad MCAP on a one square centimeter integrated circuit die, the energy module 10 offers 10-40 hours of talk time and 7-30 days of standby time before requiring a 60 second recharging.
In an example of operation, the power supply 20 converts a 110 or 220 VAC input (or other AC input voltage) into a DC output voltage (e.g., 100 Volts). The DC-to-DC converter 22 converts the DC output voltage of the power supply 20 into an energy module 10 charge voltage, which may vary from a 100 VDC to 300 VDC, or higher. The inclusion of the DC-to-DC converter 22 allows for different types of MCAPs, which have different charging voltages, to be used in the energy module. If MCAPs used in the energy module 10 will have a particular charging voltage or have a narrow range of charging voltages, then the DC-to-DC converter 22 may be omitted and the power supply 20 generates the desired charging voltage or the narrow range of charging voltages (e.g., varies by twenty percent or less).
The control module 30 generates control signals to set the desired charging voltage and current limiting control signals based on various input data. The input data includes characteristics desired charging voltage of the energy module, charging current limits of the energy module, energy storage capabilities of the energy module, etc. The control module 30 provides the charging control signal to the DC-to-DC converter 22 (or to the power supply 20 when the DC-to-DC converter 22 is integrated into the power supply 20) to establish the charging voltage.
When the MCAP structure 26 is being charged, the current limiter 24 limits the charge current provided by the DC-to-DC converter 22 to the MCAP structure 26 in accordance with the current limit control signals. The current limit control signals will be based on requirements of the MCAP structure 26 and the construct of the MCAP structure 26. For example, if the MCAP structure 26 includes a plurality of MCAPs coupled in parallel for charging, then the current limit will be a multiple of a desired charging current for an individual MCAP.
As the MCAP structure 26 is being charged, the DC-to-DC conversion system 28 may or may not be activated. For example, the DC-to-DC conversion system 28 will not be activated if a device 12 is not coupled to the energy module; if the device 12 is coupled to the energy module, but is not turned on; if the design of the energy module 10 prohibits producing a DC output for a device 12 when the MCAP structure 26 is being charged. As another example, the DC-to-DC conversion system 28 will be activated if a device 12 is coupled to the energy module, the device 12 is not turned on, and the design of the energy module 10 allows producing a DC output for the device 12 when the MCAP structure 26 is being charged.
When the DC-to-DC conversion system 28 is activated, the control module 30 generates DC output control signals based on the device requirements e.g., how many DC voltages it needs, at what level, power requirements, current limiting requirements, etc.). In response to the DC output control signals, the DC-to-DC conversion system 28 generates one or more DC output voltages to power the device 12. In addition, the DC-to-DC conversion system 28 establishes current limits for each of the DC outputs it generates based on the DC output control signals. Depending on the device 12, the DC-to-DC conversion system 28 generates one or more DC output voltages in the range of one volt, or less, to 100 volts, or more. For instance, if the device 12 is a battery-powered device 12, the DC-to-DC conversion system 28 generates a 1.5 VDC output, a 3.3 VDC output, a 4 VDC output, a 12 VDC output, etc.
The energy module 10 may provide feedback to the charger 14. The feedback includes current being drawn during the charging, rate of charging, charging voltage applied to MCAP structure 26, desired charging voltage, desired current limit, and/or enable/disable charging signals. The charger 14 uses the feedback, when provided, to establish the charging voltage, current limit settings, and/or surge protection settings.
When the charger 14 is disconnected, the by-pass circuitry couples the MCAP structure 26 to the DC-to-DC conversion system 28. The by-pass circuitry may also couple the MCAP structure 26 to the DC-to-DC conversion system 28 when the charger 14 is connected if the MCAP charging circuitry 38 and/or control module 30 of the energy module 10 determines that the MCAP structure 26 will be sufficiently charged while it is being charged and supplying energy to the DC-to-DC conversion system 28.
In this embodiment, the control modules source, receive, and/or exchange, data, safety information, and/or programming information. The data may include information regarding use the energy module, what devices it has been coupled to, information regarding the devices, charging information, and/or charging history, etc. The safety information may include short circuit protocols, overvoltage protocols, high voltage sensing data, leakage voltage, leakage current, and/or other information that effects the safety of charging the energy module, of using the energy module, and/or human handling of the energy module. The programming information may include what charging program the energy module 10 is affiliated with (e.g., charging rate, charging costs, authorized uses who can charge, etc.), what devices the energy module 10 can operate with, what chargers the energy module 10 can be charged by, etc.
In an example of operation and when the energy module 10 is coupled to a device 12, the energy control module 42 communicates device data and device sensor data with the device 12. The device data includes a wide variety of data regarding the use of the device 12 (e.g., how often, what applications, etc.), particular information regarding the device 12 (type, serial number, etc.), and/or the operational characteristics of the device 12 (e.g., power consumption, average current draw, peak current draw, etc.). The device sensor data includes overvoltage conditions within the device 12, overload conditions within the device 12, short circuits within the device 12, user contact with the device 12, environmental conditions (e.g., device dropped in water), etc.
When the energy module 10 is connected to the charger 14, it shares the device data and the device sensor data with the charger 14. The energy module 10 and the charger 14 also communicate feedback, safety information, and programming information as previously described. As an example of communicating device data, the energy module 10 collects device data that includes data regarding power consumption, recharging frequency, average current draw, peak current draw, etc., from the device 12. When the energy module 10 is connected to the charger 14, the energy module 10 provides the device data to the charger 14, which conveys the device data to a charging server via the RF data link 44. The charging server may use this device data to determine how effective the energy module 10 is powering the device 12. For example, does the energy module 10 have too much energy storage for the device 12; does the energy module 10 have too little energy storage for the device 12; etc.
As another example, the charger control module 40 collects information regarding the charging of the energy module 10 and provides that information to the charging server may use the charging data of the energy module 10 to generate billing data for charging the energy module. The charging server may also use the charging data of the energy module 10 to monitor warranty compliance, exhaustion, etc.
In an example of operation and when the charger 14 is coupled to an AC voltage source, the rectifier circuit 50 rectifies an AC input voltage into a rectified AC voltage. The currently limiting circuitry (which may include an inductor, a transistor, a surge protector, an impedance, and/or other type of current limiting circuit) limits the current provided to the capacitor structure, which is of sufficient capacitor to provide a DC voltage with an acceptable ripple voltage for powering the DC-to-DC converter 22.
The DC-to-DC converter 22 converts the CAP structure voltage into a charger voltage based on feedback received from an energy module 10 or as a default charger voltage. For instance, the charger voltage may range from 24 volts to 300 volts or more. In addition, the DC-to-DC converter 22 may produce different charger voltages during different phases of charging the energy module. For example, if the energy module 10 is nearly depleted (e.g., has a voltage of about 20 volts), the DC-to-DC converter 22 produces an initial charger voltage of approximately 100 VDC to limit the potential in rush current with charging the MCAP structure 26. When the energy module 10 is further along in charging process, the DC-to-DC converter 22 generates a higher charger voltage and continues to increase the charger voltage until it reaches the desired maximum charger voltage.
The charge current limiter 24 functions to limit the in rush current when the MCAP structure 26 of the energy module 10 is being charged. Note that the charger current limiter 24 may be omitted if the energy module 10 includes a sufficient in rush current limiting circuit. One or more embodiments of the charge current limiter 24 will be discussed with reference to one or more subsequent figures.
In an example of operation, the power supply 34 may receive an AC input voltage of 110 VAC or a 220 VAC (or other comparable voltages). When the AC input voltage is 110 VAC, two of the switches are open and one of the switches is closed. With this switch configuration, the AC input voltage is applied across the top MCAP structure 26 of the series connected MCAP structure 26 when it is in the positive phase of its cycle and applied across the bottom MCAP structure 26 when it is in the negative phase if its cycle. In this manner, each MCAP structure 26 is charged to a peak voltage of about 140 volts. When the AC input voltage is 220 VAC, two of the switches are closed and one of the switches is open. With this switch configuration, the AC input voltage is applied across the series connected MCAP structure 26. In this manner, the series connected MCAP structure 26 is charged to a peak voltage of about 280 volts. In most embodiments of the power supply 34, the MCAPs will have substantially similar capacitances such that they will have substantially the same voltages and supply substantially the same amount of energy. However, in an embodiment, it may be desired to have the MCAP structure 26 of different capacitance values.
The low loss current limiting circuit limits the current to the MCAP structure 26. When the AC input voltage is first applied to the power supply 34 and the MCAP structure 26 are substantially discharged, the current limit selection module sensing a low voltage across the bottom MCAP structure 26, which, in most embodiments, is representative of the voltage across both MCAP structures 26. When the voltage across the MCAP structure 26 is low, the current limit selection module enables the transistor coupled in series with the highest impedance to provide the highest current limiting. As the MCAP structures 26 are charging, the current limit selection module enables another transistor coupled in series with lower impedance to provide lower current limiting. When the MCAP structures 26 are fully charged, the current limit selection module enables the transistor coupled in series with the lowest impedance to provide the lowest current limiting. Note that, when no AC input voltage is applied, the low loss current limiting circuit is configured such that the transistors are open.
The current limit selection module may generate the control signals to open and close the switches based on the voltage across the MCAP structure 26. For example, when the AC voltage source is first coupled to the power supply 34, the current limit selection module places the switches in the 220 VAC mode. If, after a certain time period (e.g., a few milliseconds to a few seconds), the voltage across the MCAP structure 26 is about half of the desired voltage, then the current limit selection circuit changes the switch configuration to the 110 VAC mode.
In an example of operation, the input rectifier circuit converts the AC input voltage into a rectified AC voltage. The AC input voltage may be 110 VAC or 220 VAC and the input rectifier circuit may further include the 110/200 switches of
The switching transistors are coupled to the rectified AC voltage and, based regulation signals provided by the regulation circuit to the full bridge switching circuit, provide a high frequency AC input voltage to the transformer. For example, the rectified AC voltage may have a frequency of 100 to 120 Hz and the switching frequency of the full bridge switching circuit may be 100 KHz or more. Note that another switch mode power supply 34 topology may be used (e.g., a half bridge converter).
The transformer steps up or down its primary voltage based on the turns ratio of the transformer. For instance, the transformer may have a turns ratio of 1:3 such that the secondary voltage is three times the primary voltage. The output rectifier circuit rectifies the secondary voltage of the transformer that is filtered by the inductor and the capacitor structure (e.g., an MCAP structure 26 and/or a conventional capacitor). The charge current limit circuit functions as previously and/or subsequently described.
To regulate the charge voltage to a desired value (e.g., from 24 volts to 300 volts or more), the divider circuit (e.g., a capacitor divider and/or a resistive divider) provides a feedback voltage to the regulation circuit. The regulation circuit compares the feedback circuit with a reference voltage to generate the regulation signals it provides to the full bridge switching circuit. For example, when the comparison indicates that the regulated charge voltage is low, the regulation circuit generates the regulation signals to increase the duty cycle and thus increase the effective secondary voltage (e.g., increase the pulse width and/or increase the switching frequency).
If the rectified AC voltage is substantially unfiltered by a capacitor or other filtering circuit, the rectified AC voltage sensing circuit senses when the rectified AC voltage is above a threshold and provides this information to the regulation circuit. When the rectified AC voltage is above the threshold (e.g., 30 volts or any other desired voltage), the regulation circuit generates the regulation signals based on the divider feedback. When the rectified AC voltage is at or below the threshold, the regulation circuit does not generate the regulation signal such that the switching transistors remain off while the rectified AC voltage is below the threshold.
In an example of operation, the power supply 34 within the charger 14 generates an output voltage, which may be the rectified voltage, a 280-volt DC voltage, or other voltage. The DC-to-DC converter 60 converts the power supplies output voltage into the desired charging voltage (e.g., 24 volts to 300 volts or more) that is provided to the MCAP structure 26 via the charge current limiter 62. The MCAP structure 26 includes a plurality of MCAPs coupled in parallel. The DC-to-DC conversion system 28 converts the MCAP voltage into one or more DC output voltages.
The DC-to-DC converter 60 of the MCAP charging circuitry 38 converts the relatively low voltage input into the desired charging voltage based on signals received from the energy control module 42. The energy control module 42 determines the desired charging voltage and provides corresponding control signals to the DC-to-DC converter 22. The energy control module 42 also determines the charging current limits and provides corresponding control signals to the charge current limiter 24.
The DC-to-DC conversion system 28 includes a full bridge switching circuit 70, switching transistors, a transformer assembly, a plurality of rectifier circuits, a plurality of capacitors, a plurality of selection transistors, a selection circuit 72, an MCAP voltage sense circuit 74, an output filtering circuit, a current limit circuit 76, and a regulation circuit 78. The transformer assembly includes a single primary & multiple secondary transformer, a plurality of single primary & single secondary transformers, or a combination thereof. The rectifying circuits include full wave rectifiers (e.g., four diodes) and/or half wave rectifiers (e.g., two diodes).
In an example of operation, the MCAP structure 26 provides a voltage in the range of 30 VDC to 300 VDC, or more, to the switching transistors. The switching transistors are turned on and off based on signaling from the full bridge switching circuit to produce an AC primary voltage. The full bridge switching circuit includes drive circuits that are dependent on the transistor type of switching transistors. For example, if the switching transistors are field effect transistors (FETs), then the drive circuits are voltage drive circuits that each includes a voltage isolation circuit (e.g., transformer, optocoupler, etc.).
The AC primary voltage is applied to the primary of the transformer assembly. When the transformer assembly includes a single primary and multiple secondary transformer, the transformer generates secondary AC voltages via the secondary windings. The MCAP voltage sense circuit determines the current MCAP voltage level (which varies greatly) and provides an indication thereof to the selection circuit. The selection circuit provides a control signal to one of the selection transistors, which couples one of the secondary AC voltages to the output filtering circuit (e.g., inductor and capacitor).
As an example and with reference to
Continuing with the example and with reference to
Returning to the discussion of
The current limit circuit senses the output current supplied by the DC-to-DC conversion system 28. When the output current exceeds a threshold, the current limit circuit provides a signal to the regulation circuit. The regulation circuit scales back on the regulation signals to disabling the regulation signals in proportion with the level at which the output current exceeds the threshold. In one embodiment, the current limit circuit includes a resistor in series with the output and the voltage drop across the resistor is used to represent the output current. In another embodiment, the voltage drop across the selected transistor is used to represent the current.
For the secondary windings not selected, the capacitor coupled to the corresponding rectifying circuit limits the voltage swing. The size of the capacitors depends on the acceptable voltage swing, output power of the DC-to-DC conversion system 28, and switching frequency of the DC-to-DC conversion system 28. With respect to selecting, the MCAP voltage sensing circuit may sense the MCAP voltage directly or sense the rectified voltage of one of the secondary windings.
When the DC output voltage of the DC-to-DC conversion system 28 is greater than 12 volts (e.g., 15 volts to 100 volts), a differing number of secondary windings may be used with different turns ratios. For instance, when the desired DC output voltage is 100 volts and the MCAP voltage is in the range of 30-60 volts, the secondary winding would have a set up turns ratio with respect to the primary winding.
While the DC-to-DC conversion system 28 of this figure only shows one DC output, it may readily be modified to have multiple DC outputs. For example, the DC-to-DC conversion system 28 includes one or more additional output filtering circuits that can be coupled to one of the secondary windings. In this example, two or more secondary winding may be selected and coupled to separate output filtering circuits to produce multiple DC outputs. As another example, the DC-to-DC conversion system 28 includes one or more linear regulators to produce additional DC outputs.
This DC-to-DC conversion system 28 operates similarly to the DC-to-DC conversion system 28 of
As an example, assume the desired output voltage is in the range of 1-12 VDC and the MCAP voltage will vary from 30 VDC to 300 VDC. As with the example of
As an example, if the primary winding has 210 turns, then a first secondary winding would have 14 turns to provide a 15:1 turns ratio. A second secondary winding would have 7 turns such that, when coupled in series with the first secondary winding, yields 21 turns on the secondary to provide a 10:1 turns ratio. A third secondary winding would have 11 turns such that, when coupled in series with the first and second secondary windings, yields 32 turns on the secondary to provide a 6.5:1 turns ratio. A fourth secondary winding would have 17 turns such that, when coupled in series with the first, second, and third secondary windings, yields 49 turns on the secondary to provide a 4.3:1 turns ratio. A fifth secondary winding would have 42 turns such that, when coupled in series with the first, second, third, and fourth secondary windings, yields 91 turns on the secondary to provide a 2.3:1 turns ratio.
In an example of operation, MCAP1 and MCAP2 are each capable of charging up to a desired voltage (e.g., 300 volts), which creates a rail voltage of up to twice the desired voltage (e.g., 600 volts). The half bridge switching circuit creates a common point between MCAP1 and MCAP2 and a half rail voltage of up to the desired voltage (e.g., 300 volts). When the control module determines that the MCAPs should be in supply mode, the control module sends switch signals to the MCAP structure 26 to couple MCAP1 and MCAP2 in series with the half bridge switching circuit by closing switch S3. When in supply mode and when T1 is on, energy is being drawn from MCAP1. When in supply mode and when T2 is on, energy is being drawn from MCAP2. Therefore, for a first half cycle, T1 is on, MCAP1 is providing energy, and the voltage with respect to the transformer is up to the desired voltage (e.g., +300 volts). For the next half cycle, T2 is on, MCAP2 is providing energy, and the voltage with respect to the transformer is up to the desired voltage (e.g., −300 volts).
When the control module determines that the MCAPs should be in a charge mode, the control module sends switch signals to the MCAP structure 26 to couple MCAP1 and MCAP2 in parallel with the half bridge switching circuit by closing switches S1 and S2. With the MCAPs in parallel with the half bridge switching circuit, T1 and T2 are disconnected from MCAP1 and MCAP2 so that MCAP1 and MCAP2 can charge from an external source (e.g., a 300 volt source).
In an example of operation, MCAP1 is capable of charging up to a desired voltage (e.g., 300 volts), which creates a rail voltage of the desired voltage. The half bridge switching circuit creates a common point between MCAP2 and MCAP3 so that MCAP2 and MCAP3 may each be charged up to a half rail voltage (e.g., 150 volts). With reference to
In an example, when the MCAP voltage is above a threshold (e.g., 50-100 volts), the MCAP voltage sensor selects a full or half bridge convertor topology. When the MCAP voltage is below a threshold (e.g., 50-100 volts), the MCAP voltage sensor selects a buck convertor topology. The buck convertor topology is selected at lower voltage to get additional energy out of the MCAP before recharging.
In an example of operation, the voltage sense unit senses when the voltage drops in the MCAP structure 26 and alerts the control module. The control module sends switch control signals to the MCAP structure 26 to adjust the variable MCAP configuration in order to maintain the desired voltage (e.g., between 150-300 volts).
In an example of operation, the variable MCAP configuration maintains a desired voltage (e.g., 150-300 volts) by reconfiguring the variable MCAP configuration as described in
As an example and with reference to
As another example and with further reference to
When a battery powered device 12 is using the energy module, the energy module 10 can effectively mimic the voltage decay of the device's battery. Instead of mapping the MCAP's remaining energy to a point in the device's battery voltage use curve and adjusting the DC output to a certain value (e.g., 5 volts) as in
In an example, assume that the device 12 requires two supply voltages at different power levels (e.g., 1.5 V at 0.5 W and 3.3 V at 2 W). Further assume that the variable MCAP structure 26 includes 25 MCAPs. The control module would allocate three DC-to-DC conversion systems 28 to supply to the desired voltages. With an objective of having the energy of the 25 MCAPs being relatively evenly consumed, the control module would allocate 5 MCAPs for the 1.5 V DC-to-DC conversion system 28 and 20 MCAPs for the 3.3 V DC-to-DC conversion system 28 (since it is four times the power of the 1.5 V output.
With the allocations determined, the control module enables a set of switches to couple five of the MCAPs to a first DC-to-DC conversion system 28 for the 1.5 V at 0.5 W output and enables another set of switches to couple 20 MCAPs in parallel and to a second DC to DC conversion system for the 3.3 V at 2 W output. Each of the DC-to-DC conversion systems 28 may be of the type that has been previously discussed and/or will be subsequently discussed.
For instance, the control module determines a power ratio with respect to one of the supply voltages and the others. In this example, the 1.5 V output has a 2-to-1 power ratio with respect to the 4.2 V output and the 12 V output has a 10-to-1 power ratio with respect to the 4.2 V output. Thus, for the MCAPs to be consumed in an evenly manner, it is desirable to allocate the MCAPs to the supply voltages based on the power ratios. An exact allocation of MCAPs to the supply voltages is not possible since the energy module 10 includes only eight MCAPs. For an exact MCAP allocation based on power ratios, the energy module 10 would need at least 13 MCAPs, or multiples thereof.
When the exact allocation cannot be achieved, a next best approach is to determine whether an exact allocation of the MCAPs can be made for at least some of the supply voltages (e.g., the ones having the higher power requirements). In this example, the 12 V output has a 5-to-1 power ratio with respect to the 1.5 V output. As such, an exact allocation of MCAPs can be achieved by allocating five times as many MCAPs to the 12 V output as to the 1.5 V output. In this example, with eight MCAPs, five of them can be allocated to the 12 V output and 1 can be allocated to the 1.5 V output, leaving, for the moment, two unallocated MCAPs.
With the remaining 2 MCAPs, the control module determines to allocate one of them to the 4.2 V output and to keep the other in reserve. As the device 12 is used, the control module monitors the power consumption of each of the output voltages and the corresponding energy consumption of the allocated MCAPs. If the monitored energy consumption closely correlates to the requested power consumption when the initial MCAP allocations were made, the control module may decide how to use the reserved MCAP and/or to adjust MCAP allocation. For instance, the control module flip-flops the allocation of the MCAPs to the 4.2 V output and the 1.5 V output such that the MCAP that was sourcing the 4.2 V output is now sourcing the 1.5 V output and vice versa. Alternatively or in addition to, the control module may allocate the reserved MCAP to one of the supply voltages.
If the monitored energy consumption does not closely correlate to the requested power consumption when the initial MCAP allocations were made, the control module may completely, or partially, reallocate the MCAPs among the output voltages. For instance, if the 12 V output is consuming only 0.2 Watt-hours, the control module reallocates the MCAPs such that one is allocated to the 4.2 V output, two are allocated to the 1.5 V output, and four are allocated to the 12 V output.
The control module may keep more than one MCAP in reserve depending on a number of factors. For example, the device 12 may send a control signal to the control module indicating that two or more MCAPs are to be held in reserve. As another example, the control module determines that the best allocation of the MCAPs to the output voltages includes having two or more MCAPs held in reserve. As yet another example, the control module may receive information from a server, where the information indicates that, for this type of device 12, it is advisable to keep two or more MCAPs in reserve.
Regardless of whether the charger 14 is the individual charger 14 or universal charger 14, it includes circuitry to receive data from an energy module. The charger 14 also includes circuitry to exchange data with a charging service provider via network. When connected to an energy module, the charger 14 collects data from the energy module. The data includes user information, device information, and utilization information. The user information includes identity of the user, account information, registration information, and/or any other data relevant regarding a user. The device information includes data regarding devices to which the energy module 10 has been coupled. For example, the data regarding devices includes a device identifier, a device serial number, a device type, and/or any other relevant information regarding the device 12.
The utilization information includes a variety data points regarding use of the energy module. For example, the utilization information includes the number of times the energy module 10 has been charged, historical data of charging the energy module, intervals between charging, identity of chargers that have charged the energy module, the number of charges remaining, charging subscription information, operating temperatures of the energy module, and/or any other relevant information regarding the charging of the energy module. The utilization information may also include information regarding usage of the device 12. For example, the utilization information includes power consumption, time of use, time of day, identity of user applications, and/or any other relevant information regarding use of the device 12.
The charger 14 sends the data it collects regarding an energy module 10 to the charging service provider 112 via the network 110. The charging service provider utilizes the energy module 10 data in a variety of ways. For example, the charging service provider utilizes the energy module 10 data for billing with respect to charging the energy module. In this example, charging of an energy module 10 is done on a subscription basis. In particular, an energy module 10 is associated with a subscription account that is debited each time the energy module 10 discharged. As another example, the charging service provider interprets the charging history of the energy module 10 to determine if the energy module 10 is being charged and an optimal manner. If not, the charging service provider provides instructions to a charger 14 regarding optimal charging of this particular energy module. The charger 14 may pass this information along to energy module 10 such that the energy module 10 stores the information for future charge.
As yet another example, the charging service provider interprets the device use information to determine a pattern of use. From the pattern of use, the charging service provider generates targeted information for the particular device 12, which is passed to the device 12 via the charger 14 and energy module. The targeted information includes recommended applications, power saving suggestions, and/or any information that may be relevant to a user of the device 12.
If, however, the request was not validated (e.g., an account is not established, the account has expired, the energy module 10 is not authenticated, a subscription has expired, etc.), the charger 14 sends an authentication request to an administrator of a charging service provider. In addition, the charger 14 sends a denial message to the energy module. Under these conditions, the charging service administrator, the charger 14, and the energy module 10 coordinate to authenticate and register the energy module. For instance, the charging service administrator determines whether the energy module 10 is affiliated with a particular user, a particular account, a particular subscription, etc., and determines that such an affiliation is valid. Upon authenticating the energy module, the charging service administrator provides an authentication response to the charger 14. The charger 14 registers the energy module 10 and notifies the energy module 10 of the registration.
Upon receiving verification of registration, the energy module 10 sends a signal to the charger 14 indicating that it is ready for charging. At this point, the charger 14 commences charging of energy module 10 and monitors the charging until it is complete. Upon completion of the charging, the charger 14 compiles charging data and any other data and forwards it to the charging service provider. Periodically, the charging service provider provides a charging report and other relevant information to the energy module. The report may include invoicing information, subscription information, remaining charges, etc. The energy module 10 may provide the charging report to the device 12 such that relevant information may be displayed to a user of the device 12.
The charger 14 forwards the registration request (which may also include information regarding the charger 14) to the charging service administrator, which obtains security information regarding the energy module 10 via a different communication means (e.g., different communication link, from a manufacturer of the energy module, from an on-line registration form submitted by a user of the energy module, etc.). The security information includes a user identifier, account identifier, a security code, and/or any other desire security information. The charging service administrator processes the registration request. If the security information and the registration request correspond, the charging service administrator sends a registration confirmation to the charger 14.
The charger 14 establishes an affiliation with the energy module 10 (e.g., registers the energy module 10 for future charging) and provides a registration response and corresponding affiliation information to the energy module. The energy model records this information for future use.
The device 12 interprets the charging registration response to determine whether it is valid at step 124. For example, the device 12 may be in communication with the charging service provider to verify that the energy module 10 is properly registered. As another example, the device 12 accesses a database regarding energy module registration. If the device 12 determines that the energy module 10 is properly registered, the method is concluded.
If, however at step 124, device 12 determines that the energy module 10 is not properly registered, the device 12 sends, at step 126, the energy module information to the administrator of the charging service provider. The method continues at step 128 with the administrator registering the energy module 10 for charging services. The method continues in two paths. In the first path, the administrator sends, at step 130, charging registration information to the device 12, which forwards it to the energy module at step 132.
In the second path, the administrator determines, at step 134, whether there is a known charger 14 affiliation with the energy module. For example, if the energy module 10 is embedded in a device 12 that was sold with the charger 14, the administrator readily determines the known affiliation. As another example, the administrator determines the affiliation of the energy module 10 with a charger 14 based on a lookup table, database, and/or other search mechanism. If there is no known affiliation, the method continues at step 140 with the administrator waiting for an authentication requests from a charger 14.
If there is a known affiliation, the method continues at step 136 with the administrator sending affiliation information to the charger 14. The method continues at step 138 with the charger 14 forwarding the affiliation information to the energy module.
The communication interfaces are of the same type to allow data to be communicated between the charger 14 and the energy module. For example, the communication interfaces may include one or more of Bluetooth interfaces, near field communication interfaces, one-wire interfaces, two wire interfaces, etc. For the wired interfaces, the communication interfaces utilize one or more wired communication protocols (e.g., fire-wire, I2C, SPDIF, RS485, USB, RS232, etc.).
The security module and energy control module 42 of the energy module 10 work in conjunction with the security verification module and the charge control module of the charger 14 to ensure authenticity of the charger 14 and of the energy module. For example, the security module is hard coded with security information (e.g., unique ID, serial number, encryption key, passcode, etc.) of the energy module. With this information hard coded, it is tamper resistant. When the energy module 10 couples to the charger 14, the energy control module 42 retrieves at least some of the security information from the security module and conveys it to the charge via the communication information. This may be done each time the energy module 10 is coupled to the charger 14 regardless of the purpose for the coupling.
The charger control module 40 verifies the security information of the energy module 10 with corresponding information stored in the security verification module. When the security information is verified, the energy module 10 and charger 14 may perform the desired function (e.g., charge the energy module, exchange data, perform software updates, etc.).
To insure that the security protocols are followed before performing a desired function, the energy control module 42, the security module, the security verification module, and the charger control module 40 include features that make them, and the security protocols, tamper proof and/or bypass proof. As an example, the security protocol requires a communication between the energy module 10 and the charge to be encrypted using a shared secret encryption key, a public-private key pair, etc. As another example, the security protocol requires each communication to include a header section that includes the hard coded security information of the energy module.
In an example of operation, when the energy module 10 is coupled to the charger 14, the energy module 10 sends an affiliation request for one or more functions (e.g., charging, data transmission, data reception, software update, etc.) to the charger 14. The affiliation request is initiated by the energy control module 42 and provided to the security module via a hard wire connection. The security module stores security information of the energy module 10 (e.g., module ID, serial number, encryption key, pass code, etc.) and modifies the affiliation request in accordance with a security protocol. For example, the security module may encrypt the affiliation request, add a secure header to the affiliation request, etc.
Upon receiving the secure affiliation request, the security module of the charger 14 performs the inverse security protocol to verify the affiliation request. If verified, the security module provides the affiliation request to the charger control module 40 for subsequent processing.
In an example of operation, when the energy module 10 is coupled to the device 12, the energy module 10 sends an affiliation request for one or more functions (e.g., sourcing energy, data transmission, data reception, software update, etc.) to the device 12. The affiliation request is initiated by the energy control module 42 and provided to the security module via a hard wire connection. The security module stores security information of the energy module 10 (e.g., module ID, serial number, encryption key, pass code, etc.) and modifies the affiliation request in accordance with a security protocol. For example, the security module may encrypt the affiliation request, add a secure header to the affiliation request, etc.
Upon receiving the secure affiliation request, the security module of the device 12 performs the inverse security protocol to verify the affiliation request. If verified, the security module provides the affiliation request to the device control module for subsequent processing.
In an example of operation, when the energy module 10 is coupled to the device 12, the device 12 sends an affiliation request for one or more functions (e.g., sourcing energy, data transmission, data reception, software update, etc.) to the energy module. The affiliation request is initiated by the device control module and provided to the security module via a hard wire connection. The security module stores security information of the device 12 (e.g., device ID, serial number, encryption key, pass code, etc.) and modifies the affiliation request in accordance with a security protocol. For example, the security module may encrypt the affiliation request, add a secure header to the affiliation request, etc.
Upon receiving the secure affiliation request, the security module of the energy module 10 performs the inverse security protocol to verify the affiliation request. If verified, the security module provides the affiliation request to the energy control module 42 for subsequent processing.
In an example of operation, the charger 14 is coupled to the energy module 10 via the safety circuitry, which provides a high-voltage connection therebetween. As previously discussed, the charging voltage supplied by charger 14 may be 300 V or more. Accordingly, various safety measures need to be taken to ensure that human beings can safely handle the charger 14 and/or the energy module. During charging, the safety sensors of both the charger 14 and energy module 10 check for a potential safety issue. If a potential safety issue is detected, the corresponding sensor sends an alarm signal to the corresponding control module.
The control module interprets the alarm signal to determine the appropriate response. For example, the control module may determine that the appropriate response is to disable charging. As another example, the control module may determine that the appropriate response is to adjust the charging voltage and or overload protection circuitry. As yet another example, the control module of one device 12 communicates with the control module of the other device 12 and collectively they determine the appropriate response.
In an example of operation, when the high-voltage male connector is coupled to the high-voltage female connector, the overvoltage sense circuit and the overcurrent sense circuit of each high voltage interface monitors for an over voltage condition and an over current condition, respectively. If an overvoltage or over current condition is detected, the corresponding sensing circuit enables the triac and/or SCR to clamp the voltage on the high voltage male and female connectors to safe voltage and current levels. In addition, the clamping may cause the fuse to blow, thereby creating an open circuit. As an alternative to using a fuse, the high-voltage interface may include a circuit breaker.
The high-voltage safety circuits of the charger 14 and energy module 10 function to provide a make before enable high-voltage connector. As such, the high-voltage connectors will mate prior to the connect/disconnect circuitry being enabled. Once enabled, the connect/disconnect circuitry provides the charge voltage (e.g., 300 V or more) to the MCAP structure 26 of the energy module. As shown in
When the low-voltage sensory connectors are coupled together as shown in
The N channel power transistor is enabled when the trigger circuitry is receiving the five volts from the connector. When the trigger circuitry does not receive in the five volts, the N channel power transistor is off. The P channel transistor is enabled via the P channel drive circuitry when the 5 V is received via the connector and is disabled when the 5 V is not received via the connector. The P channel drive circuitry includes a pulse generator any fly-back transformer circuit. When the 5 V is received, the pulse generator is operable to drive the switching transistor of the flyback transformer circuit, which produces a gate source voltage sufficient enough to turn on the P channel power transistor.
When it is determined that the energy module 10 is coupled to the charger 14, the method continues at step 222 by determining whether the high-voltage connections there between are secure. If not, the method continues at step 224 by indicating that there is a connection issue and repeating the method. If, however, the high-voltage connections are secure, the method continues at step 226 by commencing charging of the energy module at step 226.
As the energy model is being charged, the safety sensors of the charger 14 and/or of the energy module 10 are monitored at step 228. The method continues at step 230 by determining whether as safety issue is detected. If yes, the method continues at step 232 by implementing a safety plan. An example safety plan is illustrated in
As a further example, if the safety issue is an overvoltage condition within the charger 14, the corresponding action may be to shut down the charger 14. As yet a further example, if the safety issue is an overcurrent condition in the energy module, the corresponding action may be to reduce the charging current. As yet another example, if the safety issue is a short circuit detected in the energy module, the corresponding action may be to open all high-voltage connections. As a further example, if the safety issue is an overvoltage condition within the energy, the corresponding action may be to shut down the energy module.
Returning back to the logic diagram of
In an example of operation, the power supply 34 outputs a supply voltage in the range of 50 V to 300 V, or more. The MCAP charger circuitry converts the supply voltage into a charging voltage (e.g., 300 V) that is provided to the energy module. The MCAP charger circuitry also monitors the charging of energy module 10 to ensure proper charging of the energy module.
The first voltage sense module monitors the supply voltage produced by the power supply 34 and provides the sense voltage to the control module. The control module compares the sensed voltage with a range of acceptable supply voltages. As long as the sensed voltage is within the range of acceptable supply voltages, the control module keeps the MCAP charger switch closed and the first crowbar circuit disabled. If the sensed voltage is outside the range of acceptable supply voltages, the control module makes a determination as to the appropriate course of action. For example, if the sensed voltage is above an acceptable supply voltage, the control module determines whether the power supply 34 is in a failure mode. If the power supply 34 is in a failure mode, the control module opens the MCAP charger switch and may activate the first crowbar circuit. As another example, if the sensed voltage is below an acceptable supply voltage, the control module opens the MCAP charger switch.
The first current sense circuit senses the current supply from the power supply 34 to the MCAP charger circuitry and provides the sensed current to the control module. As long as the sensed current is within the range of acceptable supply currents, the control module keeps the MCAP charger switch closed and the first crowbar circuit disabled. If the sensed current is outside the range of acceptable supply currents, the control module makes a determination as to the appropriate course of action. For example, if the sensed current is above an acceptable supply voltage, the control module determines whether there is a short circuit condition. If there is a short circuit condition, the control module opens the MCAP charger switch and disables the power supply 34.
The second voltage sense module monitors the charge voltage outputted by the MCAP charger circuit and provides the sense voltage to the control module. The control module compares the sensed voltage with a range of acceptable charger voltages. As long as the sensed voltage is within the range of acceptable charger voltages, the control module keeps the output switches closed and the second crowbar circuit disabled. If the sensed voltage is outside the range of acceptable charger voltages, the control module makes a determination as to the appropriate course of action. For example, if the sensed voltage is above an acceptable charger voltage, the control module determines whether the MCAP charger circuitry is in a failure mode. If the MCAP charger circuitry is in a failure mode, the control module opens the output switches and may activate the second crowbar circuit. As another example, if the sensed voltage is below an acceptable charger voltage, the control module opens the output switches.
The second current sense circuit senses the charge current from the MCAP charger circuitry to the energy module 10 and provides the sensed current to the control module. As long as the sensed current is within the range of acceptable charger currents, the control module keeps the output switches closed and the second crowbar circuit disabled. If the sensed current is outside the range of acceptable charger currents, the control module makes a determination as to the appropriate course of action. For example, if the sensed current is above an acceptable charger voltage, the control module determines whether there is a short circuit condition. If there is a short circuit condition, the control module opens the output switches and disables the power supply 34 and/or the MCAP charger circuitry.
While the charger 14 is shown with multiple voltage sense circuits, multiple current sensing circuits, and multiple crowbar circuits, the charger 14 may include the first set of protection circuitry (e.g., the first voltage sense circuit, the first current sense circuit, and crowbar circuit) or the second set of protection circuitry. As another alternative, the charger 14 may include the switches, the first voltage sense circuit, the second voltage sense circuit, the second current sense circuit, and the second crowbar circuit.
In an example of operation, the power supply 34 outputs a supply voltage in the range of 50 V to 300 V, or more. The MCAP charger circuitry converts the supply voltage into a charging voltage (e.g., 300 V) that is provided to the energy module. The MCAP charger circuitry also monitors the charging of energy module 10 to ensure proper charging of the energy module.
The first voltage sense module monitors the supply voltage produced by the power supply 34 and provides the sense voltage to the first overvoltage detection circuit. The first overvoltage detection circuit compares the sensed voltage with a range of acceptable supply voltages. As long as the sensed voltage is within the range of acceptable supply voltages, the first overvoltage detection circuit keeps the first crowbar circuit disabled. The first overvoltage detection circuit also provides signal to the control module indicating that the sensed voltage is within the acceptable range of voltages. Accordingly, the control module keeps the MCAP charger switch closed.
If the sensed voltage is outside the range of acceptable supply voltages, the first overvoltage detection circuit enables the first crowbar circuit and provides an overvoltage indication to the control module. In response to the signal from the first overvoltage detection circuit, the control module opens the MCAP charger switch. As another example, if the first overvoltage detection circuit determines that the sensed voltage is below an acceptable supply voltage, it provides a corresponding indication to the control module, which may open the MCAP charger switch.
The first current sense circuit senses the current supply from the power supply 34 to the MCAP charger circuitry and provides the sensed current to the first short circuit detection module. As long as the sensed current is within the range of acceptable supply currents, the first short circuit detection circuit keeps the MCAP charger switch closed. The first short circuit detection circuit also provides an indication of the sensed current to the control module. If the sensed current is outside the range of acceptable supply currents (e.g., is high and appears to be a short circuit), the first short circuit detection circuit opens the MCAP charger switch and provides a short circuit indication to the control module. In response to the short circuit indication, the control module determines whether to disable the power supply 34 and/or whether to enable the first crowbar circuit.
The second voltage sense module monitors the charge voltage outputted by the MCAP charger circuit and provides the sense voltage to the second overvoltage detection circuit. The second overvoltage detection circuit compares the sensed voltage with a range of acceptable charger voltages. As long as the sensed voltage is within the range of acceptable charger voltages, the second overvoltage detection circuit keeps the output switches closed. If the sensed voltage is outside the range of acceptable charger voltages, the second overvoltage detection circuit opens the output switches and provides an overvoltage condition indication to the control module. The control module makes a determination as to the appropriate course of action. For example, if the sensed voltage is above an acceptable charger voltage, the control module determines whether the MCAP charger circuitry is in a failure mode. If the MCAP charger circuitry is in a failure mode, the control module activates the second crowbar circuit. As another example, if the second overvoltage detection circuit determines that the sensed voltage is below an acceptable supply voltage, it provides a corresponding indication to the control module, which may open the output switches.
The second current sense circuit senses the charge current from the MCAP charger circuitry to the energy module 10 and provides the sensed current to the second short circuit detection circuit. As long as the sensed current is within the range of acceptable charger currents, the second short circuit detection circuit keeps the output switches closed. If the sensed current is outside the range of acceptable charger currents, the second short circuit detection circuit opens the output switches and provides a short circuit indication to the control module. In response to the short circuit condition, the control module may disable the power supply 34 and/or disable the MCAP charger circuitry.
While the charger 14 is shown with multiple voltage sense circuits, multiple current sensing circuits, and multiple crowbar circuits, the charger 14 may include the first set of protection circuitry (e.g., the first voltage sense circuit, the first current sense circuit, and crowbar circuit) or the second set of protection circuitry. As another alternative, the charger 14 may include the switches, the first voltage sense circuit, the second voltage sense circuit, the second current sense circuit, and the second crowbar circuit.
In an example of charging, the MCAP charging circuitry 38 receives an input charge voltage from the charger 14 and provides a charge voltage to the MCAP structure 26. The MCAP charger circuitry may convert the input charge voltage (e.g., 300 V) into the charge voltage (e.g., 300 V, 600 V, etc.) that is provided to the MCAP structure 26. The MCAP charger circuitry also monitors the charging of MCAP structure 26 to ensure proper charging thereof.
The first voltage sense module monitors the charge voltage produced by the MCAP charging circuit and provides the sense voltage to the control module. The control module compares the sensed voltage with a range of acceptable charging voltages. As long as the sensed voltage is within the range of acceptable charging voltages, the control module keeps the MCAP structure 26 switch closed and the first crowbar circuit disabled. If the sensed voltage is outside the range of acceptable charging voltages, the control module makes a determination as to the appropriate course of action. For example, if the sensed voltage is above an acceptable charging voltage, the control module determines whether the MCAP charging circuit and/or the MCAP structure 26 are in a failure mode. If the MCAP charging circuit and/or the MCAP structure 26 is in a failure mode, the control module opens the MCAP structure 26 switch and may activate the first crowbar circuit. As another example, if the sensed voltage is below an acceptable charging voltage, the control module opens the MCAP structure 26 switch.
The first current sense circuit senses the current supply from the MCAP charging circuit to the MCAP structure 26 and provides the sensed current to the control module. As long as the sensed current is within the range of acceptable charge currents, the control module keeps the MCAP structure 26 switch closed and the first crowbar circuit disabled. If the sensed current is outside the range of acceptable charge currents, the control module makes a determination as to the appropriate course of action. For example, if the sensed current is above an acceptable charge voltage, the control module determines whether there is a short circuit condition. If there is a short circuit condition, the control module opens the MCAP structure 26 switch and disables the MCAP charging circuit and/or the MCAP structure 26.
The second voltage sense module monitors the MCAP voltage outputted by the MCAP structure 26 and provides the sense voltage to the control module. The control module compares the sensed voltage with a range of acceptable MCAP voltages. As long as the sensed voltage is within the range of acceptable MCAP voltages, the control module keeps the output switches closed and the second crowbar circuit disabled. If the sensed voltage is outside the range of acceptable MCAP voltages, the control module makes a determination as to the appropriate course of action. For example, if the sensed voltage is above an acceptable MCAP voltage, the control module determines whether the MCAP structure 26 and/or the DC-to-DC conversion system 28 are in a failure mode. If the MCAP structure 26 and/or the DC-to-DC conversion system 28 are in a failure mode, the control module opens the output switches and may activate the second crowbar circuit. As another example, if the sensed voltage is below an acceptable MCAP voltage, the control module opens the output switches.
The second current sense circuit senses the charge current from the MCAP structure 26 to the DC-to-DC conversion system 28 and provides the sensed current to the control module. As long as the sensed current is within the range of acceptable MCAP currents, the control module keeps the output switches closed and the second crowbar circuit disabled. If the sensed current is outside the range of acceptable MCAP currents, the control module makes a determination as to the appropriate course of action. For example, if the sensed current is above an acceptable MCAP current, the control module determines whether there is a short circuit condition. If there is a short circuit condition, the control module opens the output switches and disables the DC-to-DC conversion system 28 and/or the MCAP structure 26.
While the energy module 10 is shown with multiple voltage sense circuits, multiple current sensing circuits, and multiple crowbar circuits, the energy module 10 may include the first set of protection circuitry (e.g., the first voltage sense circuit, the first current sense circuit, and crowbar circuit) or the second set of protection circuitry. As another alternative, the energy module 10 may include the switches, the first voltage sense circuit, the second voltage sense circuit, the second current sense circuit, and the second crowbar circuit.
In an example of operation, the first voltage sense module monitors the charge voltage outputted by the MCAP charging circuitry 38 and provides the sense voltage to the first overvoltage detection circuit. The first overvoltage detection circuit compares the sensed voltage with a range of acceptable charging voltages. As long as the sensed voltage is within the range of acceptable charging voltages, the first overvoltage detection circuit keeps the first crowbar circuit disabled. The first overvoltage detection circuit also provides signal to the control module indicating that the sensed voltage is within the acceptable range of voltages. Accordingly, the control module keeps the MCAP structure 26 switch closed.
If the sensed voltage is outside the range of acceptable charging voltages, the first overvoltage detection circuit enables the first crowbar circuit and provides an overvoltage indication to the control module. In response to the signal from the first overvoltage detection circuit, the control module opens the MCAP structure 26 switch. As another example, if the first overvoltage detection circuit determines that the sensed voltage is below an acceptable charging voltage, it provides a corresponding indication to the control module, which may open the MCAP structure 26 switch.
The first current sense circuit senses the current supply from MCAP charging circuitry 38 to the MCAP structure 26 and provides the sensed current to the first short circuit detection module. As long as the sensed current is within the range of acceptable charging currents, the first short circuit detection circuit keeps the MCAP structure 26 switch closed. The first short circuit detection circuit also provides an indication of the sensed current to the control module. If the sensed current is outside the range of acceptable charging currents (e.g., is high and appears to be a short circuit), the first short circuit detection circuit opens the MCAP structure 26 switch and provides a short circuit indication to the control module. In response to the short circuit indication, the control module determines whether to disable the MCAP charging circuitry 38, the MCAP structure 26, and/or the DC-to-DC conversion system 28 and/or determines whether to enable the first crowbar circuit.
The second voltage sense module monitors the MCAP voltage outputted by the MCAP structure 26 and provides the sense voltage to the second overvoltage detection circuit. The second overvoltage detection circuit compares the sensed voltage with a range of acceptable MCAP voltages. As long as the sensed voltage is within the range of acceptable MCAP voltages, the second overvoltage detection circuit keeps the output switches closed. If the sensed voltage is outside the range of acceptable MCAP voltages, the second overvoltage detection circuit opens the output switches and provides an overvoltage condition indication to the control module. The control module makes a determination as to the appropriate course of action. For example, if the sensed voltage is above an acceptable MCAP voltage, the control module determines whether the MCAP structure 26 is in a failure mode. If the MCAP structure 26 is in a failure mode, the control module activates the second crowbar circuit. As another example, if the second overvoltage detection circuit determines that the sensed voltage is below an acceptable MCAP voltage, it provides a corresponding indication to the control module, which may open the output switches.
The second current sense circuit senses the supply current from the MCAP structure 26 to the DC-to-DC conversion system 28 and provides the sensed current to the second short circuit detection circuit. As long as the sensed current is within the range of acceptable supply currents, the second short circuit detection circuit keeps the output switches closed. If the sensed current is outside the range of acceptable supply currents, the second short circuit detection circuit opens the output switches and provides a short circuit indication to the control module. In response to the short circuit condition, the control module may disable the MCAP structure 26 and/or disable the DC-to-DC conversion system 28.
While the energy module 10 is shown with multiple voltage sense circuits, multiple current sensing circuits, and multiple crowbar circuits, the energy module 10 may include the first set of protection circuitry (e.g., the first voltage sense circuit, the first current sense circuit, and crowbar circuit) or the second set of protection circuitry. As another alternative, the energy module 10 may include the switches, the first voltage sense circuit, the second voltage sense circuit, the second current sense circuit, and the second crowbar circuit.
In an example of operation, the control module 30 determines what features and/or functions that needs to be on for given operating conditions. For example, when the energy module 10 is being charged, the control module 30 determines that the power supply 20, DC-to-DC converter 22, and the current limiter 24 need to be active. As another example, when the energy module 10 is supplying power to a device 12, the MCAP structure 26 and the DC-to-DC conversion system 28 are active. When the energy module 10 is not being charged and is not supplying power to a device 12, the control module 30 determines what, if any, circuitry needs to be enabled.
As a specific example, the control module 30 may determine that the MC AP structure voltage should be monitored even though the energy module 10 is not being charged or supply power to a device 12. Accordingly, the control module 30 enables a high-voltage sensor to sense the voltage of the MCAP structure 26 and enables circuitry that interprets the sensed voltage. Such sensing circuitry may be periodically enabled and disabled to minimize drain on the MCAP structure 26.
An example of operation, when the charge voltage is first applied to the MCAP structure 26, the control module 30 enables the low loss charge current limit circuit 302 in a low current limit setting. This is done to prevent damaging the MCAP structure 26 when charging commences. For example, the control module 30 enables a power transistor that is coupled to a power resistor having a resistance value that limits the current to a desired level. As the MCAP structure 26 is charged and its voltage increases, the control module 30 enables different power transistors associated with different power resistors having lower resistance values to provide desired current limit levels. When the MCAP structure 26 voltage reaches a sufficient level, the control module 30 enables the power transistor that has no associated power resistor thereby providing a minimum level of current limiting.
In addition to setting the current limit values, the control module 30 also monitors the current through the selected transistor via a current mirroring circuit. The control module 30 may use the measure current of the selected transistor to determine when to make a current limit adjustment. The control module 30 also receives a sensed voltage from the voltage sensing circuit, which senses the charge voltage provided to the MCAP structure 26 to produce the sensed voltage. Accordingly, the control module 30 may use a combination of the sensed voltage and the sensed current to determine when to make a current limit adjustment.
The current mirroring circuits may use a transistor that is a scaled version of the power transistor. For instance, the current mirror transistor may be 1/10 two 1/100 the size of the power transistor. In addition, the current mirroring circuits include a resistor, wherein the voltage drop across the resistor is representative of the mirrored current of the corresponding power transistor.
Note that the low loss charge current limit circuit may include more or less than three transistors are shown. Further note that the low loss charge current limit circuit may have multiple paths (e.g., transistor in series with a resistor) concurrently enabled to provide a more fine tuned current limit value. Still further note that thermistors may be used in conjunction with or in place of the resistors. Even further note that the control module 30 performs a make before break enablement of the power transistors within the low loss charge current limits.
An example of operation, when the charge voltage is first applied to the MCAP structure 26, the control module 30 enables the low loss charge current limit circuit in a low current limit setting. This is done to prevent damaging the MCAP structure 26 when charging commences. For example, the control module 30 enables a power transistor that is coupled to a power resistor having a resistance value that limits the current to a desired level. As the MCAP structure 26 is charged and its voltage increases, the control module 30 enables different power transistors associated with different power resistors having lower resistance values to provide desired current limit levels. When the MCAP structure 26 voltage reaches a sufficient level, the control module 30 enables the power transistor that has no associated power resistor thereby providing a minimum level of current limiting.
In addition to setting the current limit values, the control module 30 also monitors the current through the selected transistor via a current mirroring circuit. The control module 30 may use the measured current of the selected transistor to determine when to make a current limit adjustment. The control module 30 also receives a sensed voltage from the voltage sensing circuit, which senses the charge voltage provided to the MCAP structure 26 to produce the sensed voltage. Accordingly, the control module 30 may use a combination of the sensed voltage and the sensed current to determine when to make a current limit adjustment.
The current mirroring circuits may use a transistor that is a scaled version of the power transistor. For instance, the current mirror transistor may be 1/10 two 1/100 the size of the power transistor. In addition, the current mirroring circuits include a resistor, wherein the voltage drop across the resistor is representative of the mirrored current of the corresponding power transistor.
Note that the low loss charge current limit circuit may include more or less than three transistors are shown. Further note that the low loss charge current limit circuit may have multiple paths (e.g., transistor in series with a resistor) concurrently enabled to provide a more fine tuned current limit value. Still further note that thermistors may be used in conjunction with or in place of the resistors. Even further note that the control module 30 performs a make before break enablement of the power transistors within the low loss charge current limits.
As an alternative to using resistors for the voltage divider, capacitors may be used. For example, R2 may be replaced with a selectable capacitor bank to provide different capacitance values to achieve the different divider ratio and R1 may be replaced with a fixed capacitor. As another example, R2 may be replaced with a fixed capacitor and R1 may be replaced with a selectable capacitor bank to provide different capacitance values to achieve the different divider ratio.
To calibrate the voltage sensing circuit, the control module 30 enables the flyback converter, which turns on the transistor allowing the resistive divide to provide a representative voltage of the MCAP voltage. The control module 30 receives the MCAP calibration voltage from the calibration circuit and disables the flyback converter. The control module 30 compares the MCAP calibration voltage to a MCAP sensed voltage produced by the voltage sensing circuit. If the voltages are within acceptable tolerances of each other (e.g., within 5% or less), then the control module 30 maintains the current settings for the control signals.
If, however, the MCAP calibration voltage and the MCAP sensed voltage are not within acceptable tolerances of each other, then the control module 30 adjusts the control signals for one or both of the switch capacitor circuits. In general, a switch capacitor circuit provides an impedance corresponding to R=1/(C*f), where R is the impedance, C is the capacitance, and f is the switching frequency. As such, the control module 30 is adjusting the switching frequency of one or both of the switch capacitor circuits to adjust one or both impedances to achieve a desired impedance divider. By using switch capacitor circuits within the voltage sense circuit, the power consumption is less than when a resistive divider is used. Further power savings can be obtained by periodically enabling the voltage sense circuit when operating conditions allow. For instance, when the MCAP voltage is being sensed to determine remaining “battery life”, the voltage sensing circuit may be enabled once every time period (e.g., 1 second, 10 seconds, 30 seconds, 1 minute, etc.).
In an example of operation and to achieve a 239:1 divider ratio for measuring the MCAP voltage above 100 V, the control module 30 generates four control signals (two for each switch capacitor circuit) at a 100 KHz. With C1 being a 40 pico-Farad capacitor and C2 being a 0.167 pico-Farad capacitor, the 239:1 divider ratio is obtained. In particular, during a first phase of a cycle, the control module 30 generates signals Φ1 and Φ4, which provides a charge to C2 from the MCAP voltage and provides a discharge to C1. Note that signals Φ1 and Φ4 may be narrow pulses to limit charge and discharge currents. During the next phase of the cycle, the control module 30 generates signals Φ2 and Φ3, which provides a discharge of C2 to C1.
To achieve a 79:1 divider ratio for measuring the MCAP voltage between 30 V and 100 V, the control module 30 generates four control signals (two for each switch capacitor circuit) at a 100 KHz. With C1 being a 40 pico-Farad capacitor and C2 being a 0.506 pico-Farad capacitor, the 79:1 divider ratio is obtained. In particular, during a first phase of a cycle, the control module 30 generates signals Φ1 and Φ4, which provides a charge to C2 from the MCAP voltage and provides a discharge to C1. Note that signals Φ1 and Φ4 may be narrow pulses to limit charge and discharge currents. During the next phase of the cycle, the control module 30 generates signals Φ2 and Φ3, which provides a discharge of C2 to C1. As an alternative to adjusting the capacitance of C2 or in addition thereto, the switching frequency for C2 may be changed. For instance, if C2 remains a 0.167 pico-Farad capacitor, the switching frequency may be adjusted to 33 KHz.
To achieve a 23:1 divider ratio for measuring the MCAP voltage between 10 V and 30 V, the control module 30 generates four control signals (two for each switch capacitor circuit) at a 100 KHz. With C1 being a 40 pico-Farad capacitor and C2 being a 1.74 pico-Farad capacitor, the 23:1 divider ratio is obtained. In particular, during a first phase of a cycle, the control module 30 generates signals Φ1 and Φ4, which provides a charge to C2 from the MCAP voltage and provides a discharge to C1. Note that signals Φ1 and Φ4 may be narrow pulses to limit charge and discharge currents. During the next phase of the cycle, the control module 30 generates signals Φ2 and Φ3, which provides a discharge of C2 to C1. As an alternative to adjusting the capacitance of C2 or in addition thereto, the switching frequency for C2 may be changed. For instance, if C2 remains a 0.167 pico-Farad capacitor, the switching frequency may be adjusted to 10 KHz.
The switch capacitor circuits of
In an example of operation, the energy module 10 and the device 12 share data via the communication link. The data may be a variety of pieces of information. For example, the device 12 provides input voltage information to the energy module, which specifies a desired input voltage level, a desired current limit, etc. Within the device 12, the power unit distributes supply voltages to the various components of the device 12. The power unit may include one or more DC-to-DC converters, one or more linear regulators, etc., to produce the supply voltages. The power unit may perform a power management function to insure that each component is receiving a minimally appropriate amount of power to perform its task(s).
As an alternative to have a power unit in the device 12, the energy module 10 performs the function of a power unit for the device 12. In particular, the energy module 10 generates the desired supply voltages and performs the desired current limiting functions. In addition, the energy module 10 may perform the power management function for the device 12 to insure that each component of the device 12 is receiving a minimally appropriate amount of power to perform its task(s).
As another example, the device 12 provides information regarding the type of battery the device 12 conventionally powered by and provides an indication regarding emulating the battery discharge pattern. In this instance, the control module 30 monitors the MCAP voltage and adjusts the DC-to-DC conversion system 28 such that it output voltages resemble the battery discharge pattern. An example of this was provided with reference to
To facilitate the power management function, the device 12 provides the energy module 10 with data regarding module-by-module power consumption, device use, application use, duration of use, network communications, and any other data regarding functionality and/or use of the device 12. From this information, the energy module 10 calculates the rate of consumption of energy and calculates remaining use time. In addition, the energy module 10 may determine its remaining life cycle (i.e., how many more times it can be recharged and, based on recharge frequency, how many more days, months, and/or years the energy module 10 has of serviceable life).
As another example, the energy module 10 provides a history of energy consumption to the device 12 and an interpretation thereof. The interpretation may include information regarding power consumption per application, power consumption for different times of the day, remaining power, etc. Based on these inputs, the device 12 may alter its performance to extend the remaining power.
The data is conveyed between the energy module 10 and the device 12 using the security information stored on the security module of the energy module. Use of this type of security module was discussed with reference to
For example, if the high voltage energy module 10 is being used for a 40 KW*hr home backup generator, then it may be desirable to have the rail voltage be 1200 VDC. The 1200 VDC rail can be achieved by coupling 4 MCAPs charged to 300 V in series. The desired power level dictates how many parallel combinations of the 4 MCAPs in series are used. For instance, an MCAP includes a plurality of MCAP cells, where an MCAP cell is a 1 cm2 CMOS device that yields 5 W*hours of power. If an MCAP includes 100 MCAP cells, then it has 500 W*hours of power. From these assumptions and for this example, 80 parallel combinations of the 4 MCAPs in series would be needed to produce 40 KW*hours of power.
In an example of operation, when conventional 110 VAC or 220 VAC is present, the VAC switch couples the 110 VAC or 220 VAC to the charger 14 and disconnects the output of the inverter. In this mode, the high voltage MCAP block structure is being charged. When AC power is lost or interrupted, the inverter is enabled and the charger 14 is disabled. In addition, the VAC switch couples the output of the inverter to the power lines within the home (or other area being serviced).
In an example of operation, the power control DC motor drive circuit receives user inputs and a DC supply voltage from the high voltage MCAP blocks. The user inputs include one or more of: on/off, forward/reverse, increase RPMs, decrease RPMs, increase power, decrease power, etc. Based on the user inputs, the power control DC motor drive circuit converts the DC supply voltage into a DC motor drive signal. For example, the DC motor drive signal is a current signal that is switched on and off, thereby switching on and off the magnetic field of the stator, which causes the armature to move. As another example, the DC motor drive signal is a current signal that has its direction through the coil of the stator reversed (e.g., 00 and 1800), which causes the armature to move.
As the user inputs change, the power control DC motor drive circuit changes the DC motor drive signal. For example, of the user input changes from a forward direction to a reverse direction, the power control DC motor drive circuit changes the DC motor drive signal to the current flow through the coil of the stator (e.g., reverse the direction of the magnetic field), thereby causing the armature to rotate in the opposite direction. As another example, if the user input is to increase power, the power control DC motor drive circuit creates the DC motor drive signal to have a higher current level, thereby increasing the strength of the magnetic field.
The power control DC motor drive circuit also includes circuitry to protect against an overvoltage condition, a short circuit condition, or other error condition that may potentially damage the MCAP blocks and/or the motor. For instance, the power control DC motor drive circuit may include protection circuitry as discussed with reference to one or more of
In an example of operation, the power control AC motor drive circuit receives user inputs and a DC supply voltage from the high voltage MCAP blocks. The user inputs include one or more of: on/off, forward/reverse, increase RPMs, decrease RPMs, increase power, decrease power, etc. Based on the user inputs, the power control AC motor drive circuit converts the DC supply voltage into an AC motor drive signal. For example, the AC motor drive signal is a sinusoidal signal that is provided to the coils of the stator to produce the desired magnetic field, which causes the rotor to move.
As the user inputs change, the power control AC motor drive circuit changes the AC motor drive signal. For example, of the user input changes from a forward direction to a reverse direction, the power control AC motor drive circuit changes the polarity of the AC motor drive signal to reverse the current flow through the coil(s) of the stator (e.g., reverse the direction of the magnetic field), thereby causing the rotor to rotate in the opposite direction. As another example, if the user input is to increase the speed, the power control AC motor drive circuit creates a higher frequency AC motor drive signal (the speed of an AC motor is primarily determined by the frequency of the AC signal and the number of poles of the stator coil(s)).
The power control AC motor drive circuit also includes circuitry to protect against an overvoltage condition, a short circuit condition, or other error condition that may potentially damage the MCAP blocks and/or the motor. For instance, the power control AC motor drive circuit may include protection circuitry as discussed with reference to one or more of
The current variations of this example are typical for a power tool. Accordingly, the power control DC motor drive circuit needs to allow for these current conditions to occur, while still protecting the MCAP blocks and the motor from damage. For example, each of these conditions is predicated by a change in a user input (e.g., turn on, increase power, change direction, etc.). Knowing the requested action and the corresponding current pattern, the power control DC motor drive circuit adjusts its levels for overvoltage protection and/or overcurrent protection based on the known current pattern. As a specific example, in-rush current may be 10-15 times a steady state current level, but only lasts for a short period of time (e.g., typically less than a few seconds). Thus, the power control DC motor drive circuit adjusts the current limit threshold high enough to allow for the in-rush current to safely occur, but does so for a short period of time.
The current variations of this example are typical for a power tool. Accordingly, the power control AC motor drive circuit needs to allow for these current conditions to occur, while still protecting the MCAP blocks and the motor from damage. For example, each of these conditions is predicated by a change in a user input (e.g., turn on, increase power, change direction, etc.). Knowing the requested action and the corresponding current pattern, the power control AC motor drive circuit adjusts its levels for overvoltage protection and/or overcurrent protection based on the known current pattern. As a specific example, in-rush current may be 10-15 times a steady state current level, but only lasts for a short period of time (e.g., typically less than a few seconds). Thus, the power control AC motor drive circuit adjusts the current limit threshold high enough to allow for the in-rush current to safely occur, but does so for a short period of time.
In an example of operation, the full bridge switching circuit, the switching transistors, the switch mode regulation circuit, and the transformer assembly function similarly to the DC-to-DC power conversion system of one or more of
The controlled output voltage is provided to the dependent current source, which generates a current at a level dictated by the current control module. The current control module determines the particular current level based on the user inputs. In addition, the current control module provides a signal to the polarity coupling circuit to indicate the polarity of the current provided to the DC motor. For example, the polarity coupling circuit, in accordance with the control signal, periodically switches on and off the supplying of current to the DC motor. This effectively switches on and off the magnetic field of the stator, which causes the armature to move. As another example, the polarity coupling circuit, in accordance with the control signal, periodically changes the polarity of the current provided to the DC motor. This effectively changes the polarity of the magnetic field of the coil of the stator reversed (e.g., 00 and 1800), which causes the armature to move.
As the user inputs vary, the control module 30 adjusts the level of the current being supplied to the DC motor, the direction of the current provided to the DC motor (e.g., for forward or reverse operation), and/or a combination thereof. In addition, the level of the controlled output voltage may be adjusted based on the user inputs to provide more or less power to the DC motor.
For instance and as shown in
One obvious solution is to select a switching frequency for the DC-to-DC conversion system 28 that does not have a harmonic frequency in the RF band. This, however, is not always possible, and is less and less possible as the RF band increases (e.g., wide band devices are continually increasing their RF band of operation).
The method begins at step 360 by determining whether a harmonic frequency of the DC-to-DC conversion system 28 falls within the RF band of operation of the RF device 12. If so, the method continues at step 362 by determining whether the harmonic frequency is interfering with transmitting signals by the RF device 12. If yes, the method continues at step 364 by determining whether the RF device 12 is transmitting at a maximum power. If not, the method continues at step 366 where the transmitting power is increased and the method repeats by determining whether the increased power overcomes the interference produced by the DC-to-DC conversion system 28.
If the transmit power is at a maximum level and the harmonic frequency of the DC to DC conversion system is interfering with transmission of signals by the RF device 12, the method continues at step 370 by adjusting the switching frequency of the DC to DC conversion system. The adjusting of the switching frequency at step 372 may not take the harmonic frequency outside of the RF band but may move it within the RF band to decrease its level of interference.
If adjusting the switching frequency does not reduce the interference to an acceptable level, the method continues at step 374 by determining whether the DC-to-DC conversion system 28 can be turned off for the transmission. If so, the method continues at step 376 where the DC-to-DC conversion system 28 is turned off (i.e., the switching frequency is disabled) for the transmission and then re-enabled once the transmission is completed.
If the DC to DC conversion system cannot be turned off for the transmission (e.g., the supply voltage produced by the DC to DC conversion system will drop to an unacceptable level during the transmission), the method continues at step 378 by determining whether the transmission channel can be changed. If so, the method continues at step 380 by changing the channel and determining whether the switching frequency harmonic is not interfering with the transmission.
If the transmission channel cannot be changed, the method continues at step 382 by determining whether the interference is unacceptable. If it is, the transmission is ended. If not, the method repeats by determining whether the switching frequency can be adjusted, the switching frequency can be disabled, and/or the transmission channel can be changed.
If the switching harmonic is not interfering with transmission, the method continues at step 368 by determining whether the switching harmonic is interfering with reception of signals. If so, the method continues at step 384 in
If the switching frequency cannot be adjusted to reduce the harmonic interference, the method continues at step 388 by determining whether the switching frequency can be disabled during reception of signals. If so, the method continues at step 390 where the switching frequency is disabled during the reception of signals. If not, the method continues at step 392 by determining whether the received channel can be changed. If the received channel can be changed, the method continues at step 394 by changing the received channel and determining whether that reduces the harmonic interference to an acceptable level.
If the received channel cannot be changed, the method continues at step 396 by determining whether the harmonic interference is unacceptable. If it is, the reception of signals is ended. If, however, the interference is not unacceptable, the method continues by trying to reduce the level of harmonic interference.
If the switching frequency cannot be adjusted to move a harmonic frequency to an unused channel, the method continues at step 406 by determining whether the switching frequency can be moved to correspond to a channel boundary (e.g., boundary between two channels). If so, the switching frequency is accordingly adjusted and the method continues by determining whether such an adjustment reduced the harmonic interference.
If the switching frequency cannot be adjusted to move a harmonic frequency to an unused channel, the method continues at step 414 by determining whether the switching frequency can be moved to correspond to a channel boundary (e.g., boundary between two channels). If so, the switching frequency is accordingly adjusted and the method continues by determining whether such an adjustment reduced the harmonic interference.
If the switching frequency cannot be adjusted to move a harmonic frequency to a channel boundary, the method continues at step 416 by determining whether the switching frequency can be adjusted to move the harmonic frequency to a transmission channel. If so and the harmonic frequency does not adversely affect transmission, the switching frequency is adjusted.
In an example of operation, the MCAP-based generating station includes a plurality of MCAP blocks to generate a high DC voltage at a substantial power level. For example, the MCAP-based generating station may generate a DC voltage in a range of 1200 V to 36,000 V or more and at a power level to power a geographic area for weeks to months. To achieve enough power to provide 10,000 homes with power for a month (assuming the average home consumes 900 KW*hrs per month), the MCAP based generating station would need to provide 9,000,000 Kilo-Watt*hrs.
With a 1 cm2 die yielding a 5 W*hr MCAP cell and with a die thickness of 0.2 mm, 1 cm3 yields a 250 W*hr MCAP cell. Accordingly, a 1 m3 block of MCAP cells produces (100*100*100)*250 W*hrs or 250,000 KW*hrs of power. Thus, to provide 10,000 homes power for a month, the MCAP-based generating station would be 36 cubic meters in size.
The step up inverter converts the output voltage of the MCAP-base generating station to a high voltage AC voltage (e.g., 138 KV, 230 KV, etc.). The high-voltage AC voltage is transmitted from the step up converter to a substation step down transformer via high voltage transmission lines. The substation step down transformer steps down the high-voltage to a lower high-voltage level (e.g., 4 KV, 9 KV, 13 KV, 20 KV, etc.). For residential use, a local transformer converts the output of the substation step down transformer to 120 V or 240 V.
It is noted that terminologies as may be used herein such as bit stream, stream, signal sequence, etc. (or their equivalents) have been used interchangeably to describe digital information whose content corresponds to any of a number of desired types (e.g., data, video, speech, audio, etc., any of which may generally be referred to as ‘data’).
As may be used herein, the terms “substantially” and “approximately” provides an industry-accepted tolerance for its corresponding term and/or relativity between items. Such an industry-accepted tolerance ranges from less than one percent to fifty percent and corresponds to, but is not limited to, component values, integrated circuit process variations, temperature variations, rise and fall times, and/or thermal noise. Such relativity between items ranges from a difference of a few percent to magnitude differences. As may also be used herein, the term(s) “configured to”, “operably coupled to”, “coupled to”, and/or “coupling” includes direct coupling between items and/or indirect coupling between items via an intervening item (e.g., an item includes, but is not limited to, a component, an element, a circuit, and/or a module) where, for an example of indirect coupling, the intervening item does not modify the information of a signal but may adjust its current level, voltage level, and/or power level. As may further be used herein, inferred coupling (i.e., where one element is coupled to another element by inference) includes direct and indirect coupling between two items in the same manner as “coupled to”. As may even further be used herein, the term “configured to”, “operable to”, “coupled to”, or “operably coupled to” indicates that an item includes one or more of power connections, input(s), output(s), etc., to perform, when activated, one or more its corresponding functions and may further include inferred coupling to one or more other items. As may still further be used herein, the term “associated with”, includes direct and/or indirect coupling of separate items and/or one item being embedded within another item.
As may be used herein, the term “compares favorably”, indicates that a comparison between two or more items, signals, etc., provides a desired relationship. For example, when the desired relationship is that signal 1 has a greater magnitude than signal 2, a favorable comparison may be achieved when the magnitude of signal 1 is greater than that of signal 2 or when the magnitude of signal 2 is less than that of signal 1. As may be used herein, the term “compares unfavorably”, indicates that a comparison between two or more items, signals, etc., fails to provide the desired relationship.
As may also be used herein, the terms “processing module”, “processing circuit”, “processor”, and/or “processing unit” may be a single processing device or a plurality of processing devices. Such a processing device may be a microprocessor, micro-controller, digital signal processor, microcomputer, central processing unit, field programmable gate array, programmable logic device, state machine, logic circuitry, analog circuitry, digital circuitry, and/or any device that manipulates signals (analog and/or digital) based on hard coding of the circuitry and/or operational instructions. The processing module, module, processing circuit, and/or processing unit may be, or further include, memory and/or an integrated memory element, which may be a single memory device, a plurality of memory devices, and/or embedded circuitry of another processing module, module, processing circuit, and/or processing unit. Such a memory device may be a read-only memory, random access memory, volatile memory, non-volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. Note that if the processing module, module, processing circuit, and/or processing unit includes more than one processing device, the processing devices may be centrally located (e.g., directly coupled together via a wired and/or wireless bus structure) or may be distributedly located (e.g., cloud computing via indirect coupling via a local area network and/or a wide area network). Further note that if the processing module, module, processing circuit, and/or processing unit implements one or more of its functions via a state machine, analog circuitry, digital circuitry, and/or logic circuitry, the memory and/or memory element storing the corresponding operational instructions may be embedded within, or external to, the circuitry comprising the state machine, analog circuitry, digital circuitry, and/or logic circuitry. Still further note that, the memory element may store, and the processing module, module, processing circuit, and/or processing unit executes, hard coded and/or operational instructions corresponding to at least some of the steps and/or functions illustrated in one or more of the Figures. Such a memory device or memory element can be included in an article of manufacture.
One or more embodiments have been described above with the aid of method steps illustrating the performance of specified functions and relationships thereof. The boundaries and sequence of these functional building blocks and method steps have been arbitrarily defined herein for convenience of description. Alternate boundaries and sequences can be defined so long as the specified functions and relationships are appropriately performed. Any such alternate boundaries or sequences are thus within the scope and spirit of the claims. Further, the boundaries of these functional building blocks have been arbitrarily defined for convenience of description. Alternate boundaries could be defined as long as the certain significant functions are appropriately performed. Similarly, flow diagram blocks may also have been arbitrarily defined herein to illustrate certain significant functionality.
To the extent used, the flow diagram block boundaries and sequence could have been defined otherwise and still perform the certain significant functionality. Such alternate definitions of both functional building blocks and flow diagram blocks and sequences are thus within the scope and spirit of the claims. One of average skill in the art will also recognize that the functional building blocks, and other illustrative blocks, modules and components herein, can be implemented as illustrated or by discrete components, application specific integrated circuits, processors executing appropriate software and the like or any combination thereof.
In addition, a flow diagram may include a “start” and/or “continue” indication. The “start” and “continue” indications reflect that the steps presented can optionally be incorporated in or otherwise used in conjunction with other routines. In this context, “start” indicates the beginning of the first step presented and may be preceded by other activities not specifically shown. Further, the “continue” indication reflects that the steps presented may be performed multiple times and/or may be succeeded by other activities not specifically shown. Further, while a flow diagram indicates a particular ordering of steps, other orderings are likewise possible provided that the principles of causality are maintained.
The one or more embodiments are used herein to illustrate one or more aspects, one or more features, one or more concepts, and/or one or more examples. A physical embodiment of an apparatus, an article of manufacture, a machine, and/or of a process may include one or more of the aspects, features, concepts, examples, etc., described with reference to one or more of the embodiments discussed herein. Further, from figure to figure, the embodiments may incorporate the same or similarly named functions, steps, modules, etc., that may use the same or different reference numbers and, as such, the functions, steps, modules, etc., may be the same or similar functions, steps, modules, etc., or different ones.
While the transistors in the above described figure(s) is/are shown as field effect transistors (FETs), as one of ordinary skill in the art will appreciate, the transistors may be implemented using any type of transistor structure including, but not limited to, bipolar, metal oxide semiconductor field effect transistors (MOSFET), N-well transistors, P-well transistors, enhancement mode, depletion mode, and zero voltage threshold (VT) transistors.
Unless specifically stated to the contra, signals to, from, and/or between elements in a figure of any of the figures presented herein may be analog or digital, continuous time or discrete time, and single-ended or differential. For instance, if a signal path is shown as a single-ended path, it also represents a differential signal path. Similarly, if a signal path is shown as a differential path, it also represents a single-ended signal path. While one or more particular architectures are described herein, other architectures can likewise be implemented that use one or more data buses not expressly shown, direct connectivity between elements, and/or indirect coupling between other elements as recognized by one of average skill in the art.
The term “module” is used in the description of one or more of the embodiments. A module implements one or more functions via a device such as a processor or other processing device or other hardware that may include or operate in association with a memory that stores operational instructions. A module may operate independently and/or in conjunction with software and/or firmware. As also used herein, a module may contain one or more sub-modules, each of which may be one or more modules.
While particular combinations of various functions and features of the one or more embodiments have been expressly described herein, other combinations of these features and functions are likewise possible. The present disclosure is not limited by the particular examples disclosed herein and expressly incorporates these other combinations.
Claims
1. An energy module comprises:
- a capacitance-based power source structure that includes a magnetic capacitor, wherein the magnetic capacitor includes a plurality of nanocells, wherein a nanocell of the plurality of nanocells includes two magnetic conductors and a dielectric having a magnetic-dielectric constant, wherein a magnetic conductor of the two conductors includes a plurality of thin film layers, wherein a first layer of the plurality of thin film layers is a metal layer and a second layer of the plurality of layers is a magnetic layer, wherein the capacitance-based power source structure is operable to: supply a voltage when the energy module is in a voltage supply mode, wherein, when substantially fully charged, the voltage is at least 48 volts; and receive a charge when the energy module is in a charge mode;
- charging circuitry operable to provide a regulated charge voltage to the capacitance-based power source structure when the energy module is in the charge mode;
- a DC-to-DC conversion system operable to convert the voltage into one or more regulated supply voltages when the energy module is in the voltage supply mode; and
- an energy control module operable to determine the voltage supply mode and the charge mode.
2. The energy module of claim 1, wherein the capacitance-based power source structure further comprises one or more of:
- a plurality of battery cells;
- a plurality of capacitor cells;
- a plurality of solar cells; and
- a plurality of hydrogen cells.
3. The energy module of claim 1, wherein the capacitance-based power source structure comprises:
- a plurality of energy source cells interoperably coupled to produce the voltage; and
- a configuration module operably coupled to the plurality of energy source cells to adjust configuration of the plurality of energy source cells to maintain a voltage range as the plurality of energy source cells are discharged.
4. The energy module of claim 1, wherein the DC-to-DC conversion system comprises:
- a configurable infrastructure to maintain the one or more regulated supply voltages at a desired level when, during discharging of the capacitance-based power source structure to supply the voltage, the voltage decreased by factor of at least three.
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Type: Grant
Filed: Aug 19, 2015
Date of Patent: Jul 9, 2019
Patent Publication Number: 20160149417
Inventors: Walter Lee Davis (Rogersville, MO), Timothy W. Markison (Mesa, AZ)
Primary Examiner: Suresh Memula
Application Number: 14/830,707
International Classification: H02J 7/00 (20060101); H02J 7/04 (20060101); H02J 7/34 (20060101);
